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2 Sheets-Sheet 1. H. P. LAMSON;

Sewing Machine.

No. 79,579. Patented July 7, 1868.

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H. P. LAMSON.

Sewing Machine.

Patented July 7, 1868.

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Letters Patent No. 79,579, dated July 7, 1868.

IMPROVEMENT IN SEWING-MAGHINES.

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TO ALL WHOM IT MAY ooncnnn:

Be it known that I, HENRY P. LAMSON, of Lowell, in the county ofMiddlesex, and State of Massachusetts, have invented certain new anduseful Improvements in Sewing-Machines, of which the following is afull, clear, and exact description, reference being bad to theaccompanying drawings, makin'gpart of this specification, in which-- iFigure 1 represents a side elevation of a sewing-machine having myimprovements applied thereto.-

Figure 2 is a horizontal section of the same on the line a: a: offig. 1. i

Figure 3 is a perspective view of the under side of the cloth-table,showing my improved spring-guide.

Figure 4 is an elevation, showing the side of the spring-guide oppositeto that represented in fig. 1. v

This invention relates to certain improvements in sewing-machines, forwhich Letters Patent were granted to Henry J. Hancock, on the 6th dayoLAugust, A. D. 1867, said machine using a single thread, and'making achain or tambour-stitch by means of an ordinarytambour or hook-eyedneedle that is made both to produce the. stitch and effect the feed ofthe cloth; and my invention consists in an improved spring-guide, whichis secured to the under side of the cloth-bed or table, serving not onlyto hold the thread and direct it into the most suitable position toinsure its being caught by the hook of the needle, but also to close thehook upon the thread and prevent its point from catching in the cloth asthe needle ascends.

To enable others skilled in the art to understand and use my invention,Iwill proceed to describe the manner in which I have carried it out. i

Referring to the accompanying drawings, A, B, and 0 represent the frameof the machine, which may be made of cast iron or other suitable metal.Said machine may be held to or secured on a bench or table by means of aplate, a, projecting from the portion A of the frame, and abinding-screw, b.

D is the spool-spindle or support on which the spool turns, the tensionof the thread being regulated by a screw-nut, c, which bears on a pieceof rubber, d, or a spiral spring placed within a tapering cup, 0, thelower end of which fits into the spool, and serves as a guide, the nut,'0, being kept in place by means of a lock-nut placed above it.

The lower end of the spindle D fits into a cavity (seen dotted) in theframe A, the cavity containing a piece of rubber or a spiralspring,which serves to force the upper end of the spindle into a cavity in theframe above. The spindle is thus held securely in place, and, with thespool, may be easily removed and replaced when desired.

E is a rod or shaft, operated by a wheel, I, in the rear, for giving, bymeans of a crank or cranked formation, g, on the said rod in front, thenecessary up-and-down and lateral motions to the needle G, to work it inand out of the cloth, and effect the feed of the latter; said needlebeing freely connected at its top with the crank, g, and working looselyor freely below throughan adjustable guide, h, and slot, 2', of astationary foot or p'resser, II, attached to the portion G of the frame.This needle isnf a tambour or hook-eyed construction atits point,and.has a flexible barb, and it works through a slot in the table 1,corresponding to the slot 2' of the foot ll. The shaft E is preventedfrom being revolved in the wrong direction, (whichwould endanger thebreaking of the needle or disnrinngcment of the stitchQ by aratchet-wheel, It, and paw], Z, as seen in fig. 1.

The tabled is supported by an arm, J, pivoted at m to the portion A ofthe frame, and provided with a stem or projection, 71, the object ofwhich will be hereinafter described. r

The thread, represented by red lines in the drawings, is passed from thespool, 0', through the eye of a spring-guide, p, fig. 3, which is madeof brass or other suitable metal, and-is secured to the under side ofthe cloth-table I. The portion 5 of this guide 2), which is providedwith an eye for the passage of the thread, is bent into such form thatwhen the needle G is carried past it, it will yield to the pressure ofthe needle, and on returning to its original position will draw thethread closely against the side of the needlejust above the barb,

and so present it in the most suitable manner to insure its being caughtby the hook or barb of the needle. This portion 5 of the guide 1), byreason of its breadth and the bend given to it, is also rigid in avertical direction, to rcsistbcing pulled upward by the thread, and sothat its point cannot by any possibility be drawn by the tensiorrofthethread into or through the slot in the table I. The other portion, 6, ofthe guide 10, which is bent over-and upward, so as to extend into theslot in the table I, also serves to guide the thread, and as the needleascends, its barb comes in contact with the portion 6 of the guide,'bywhich its point is pressed into a groove in the shank of the needle,thus securely enclosing the thread within th barb, and preventinganyliability of its escaping therefrom, while the free passage of theneedle up through the cloth is insured, as the point of the barb or hookis not exposed, and cannot catch in the cloth as the needle iswithdrawn.

The general action of my improved machine is similar to that of certainother machines; the needle in its descent penetrating the cloth, andcausing its barb to pass below the loop previously made, and which isnow left upon the needle-shank, and in its ascent catching thethreadanew, and pulling it in the form of a loop above the cloth, andthrough the previously-made loop, which is now discharged over theclosed barb and off the needle; the needle also, by its lateralmovement, feeding the cloth. To secure a sufficiently firm, yet free andreadily-adjustable hold of the cloth on the table I, said table, whichis carried by the lever or pivoted arm'J, is raised or lowered with thegreatest dispatch yet nicety, to suit diii'erent thicknesses of materialor other requirements, by means of amilled or other disk, K, turning ona centre atq on the plate a of tlieframe, and of a wedge-shaped orinclined construction on its upper face, the same being arranged belowthe stem n of the arm J, so that, on turning the disk in a suitabledirection, the table I is raised, or, by turning it in an oppositedirection, lowered, by its weight and that of the arm J, and in bothpositions of adjustment a firm base or support given to the table.

What I claim, and desire to secure by Letters Patent, is

The guide-piece p, formed with a spring thread-guide to yield againstthe pressure of the needle, and then to carry the thread athwart itspath, and also with another guide-piece, serving to govern the path ofthe thread as well'as to close the needle-barb.

I also claim the spring-guide p, in combination with the cloth-table ofa sewing-machine, and with afiexible barbed needle, operatingsubstantially as and for the purpose set forth.

I HENRY P. 'LAMSON.

-Witnesses I. E. TEscnEMAcHEn, N. W. STEARNS.

